Advanced AI Prompt for Istio Service Mesh VirtualService and Gateway

Act as a Service Mesh Architect. Generate an advanced Istio Gateway and VirtualService manifest configuration to govern ingress traffic for the domain '[HOST_DOMAIN]'. The Gateway ('[GATEWAY_NAME]') must bind to the standard `istio-ingressgateway` selector on port 80/443. The VirtualService must implement a sophisticated Canary Release traffic routing pattern: dynamically route exactly '[CANARY_WEIGHT]'% of incoming HTTP traffic to the experimental '[SERVICE_B_NAME]' subset, and the remaining traffic to the stable '[SERVICE_A_NAME]' subset. Enhance the service resiliency by injecting a hard 5-second request timeout and an automated retry policy configured for 3 attempts specifically targeting HTTP 503 Service Unavailable errors.